EXPERIMENTAL-STUDY OF HEAT-TRANSFER IN-PROCESS OF ROLLS COOLING IN ROLLING-MILLS BY WATER JETS

The paper summarizes results obtained by carrying out a large set of e xperiments that studied cooling of rolls. The experiments are based on the cooling of a steel plate by a set of flat nozzles from a starting temperature of 615 degrees C. The temperature histories measured in 3 9 points of the test plate are the inputs to the evaluation procedure. The sensor distribution covers a surface of a size of 450 x 110 mm. C lassical Beck's inverse task was extended for the 3-dimensional area. The inverse task computes the surface distribution of heat transfer co efficient history, heat flux history and surface temperature. The resu lts have pointed out a non-homogeneity in cooling by means of flat jet s and provide us with a comparison of the flat and the full cone jets. The possibility of the intensification of the cooling by non-rectangu lar spray angle is discussed. It is shown that a certain point of satu ration exists in the experimental pressure range from 0.4 to 1.2 MPa a nd increasing the pressure has a negligible influence on the cooling i ntensity.